Active multi-stage compensation device applied to neutral point resonant grounding grid

Abstract

The invention relates to the electric power electron technology field and particularly relates to an active multi-stage compensation device applied to the neutral point resonant grounding grid. The device includes a measurement and control system, a primary compensator, a secondary compensator, a three-stage compensator, a voltage transformer TV, a current transformer TA, a coupling transformer T,a damping resistor R, a vacuum contactor K1 and a vacuum contactor K2. After the active multi-stage compensation device is utilized in the neutral point resonant grounding grid, reactive component, active component and harmonic component in the grounding current can be compensated respectively, the full compensation and zero residual flow effect is achieved, generation of an arc grounding light voltage can be effectively suppressed, two-phase short circuit tripping is avoided, and safe and reliable operation of the distribution network is guaranteed.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to an active multi-stage compensation device applied to a neutral point resonant grounded power grid. Background technique [0002] Most domestic neutral point resonant grounding compensation devices adopt passive structure, and when a grounding fault occurs, the compensation is in place at one time, which often has the disadvantage of relatively large residual current after compensation. Especially with the increasing number of electronic devices used in the power grid, the harmonics generated are also increasing. The residual current caused by the traditional grounding compensation device is more considerable because it cannot compensate the harmonics. A large residual current is not conducive to the extinguishing of the grounding arc, which may lead to arc-to-ground overvoltage and two-phase short-circuit tripping, which is very detrimental to the safe and reliable oper...

AI Technical Summary

Problems solved by technology

[0002] Most of the domestic neutral point resonant grounding compensation devices adopt passive structure, and when the grounding fault occurs, the compensation is in place at one time, which often has the disadvantage of relatively large residual current after compensation

Especially with the increasing number of electronic equipment used in the power grid, the harmonics generated are also increasing. The traditional grounding compensation device cannot compensate the harmonics, resulting in more considerable residual current.

A large residual current is not conducive to the extinguishment of the grounding arc, which may lead to arc grounding overvoltage and two-phase short-circuit tripping, which is very unfavorable to the safe and reliable operation of the power grid

In addition, the traditional neutral point resonance grounding compensation device cannot compensate the active component of the grounding current, which is another aspect that leads to the increase of residual current

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